915721652 has 6 divisors (see below), whose sum is σ = 1602512898. Its totient is φ = 457860824.

The previous prime is 915721637. The next prime is 915721657. The reversal of 915721652 is 256127519.

It is a happy number.

It can be written as a sum of positive squares in only one way, i.e., 912885796 + 2835856 = 30214^2 + 1684^2 .

It is a super-2 number, since 2×915721652² = 1677092287883218208, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (915721657) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 114465203 + ... + 114465210.

It is an arithmetic number, because the mean of its divisors is an integer number (267085483).

Almost surely, 2^915721652 is an apocalyptic number.

It is an amenable number.

915721652 is a deficient number, since it is larger than the sum of its proper divisors (686791246).

915721652 is a wasteful number, since it uses less digits than its factorization.

915721652 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 228930417 (or 228930415 counting only the distinct ones).

The product of its digits is 37800, while the sum is 38.

The square root of 915721652 is about 30260.8931130593. The cubic root of 915721652 is about 971.0788478260.

The spelling of 915721652 in words is "nine hundred fifteen million, seven hundred twenty-one thousand, six hundred fifty-two".